ru.org.linux.csrf.CSRFRequestDataValueProcessor.java Source code

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Here is the source code for ru.org.linux.csrf.CSRFRequestDataValueProcessor.java

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/*
 * Copyright 1998-2012 Linux.org.ru
 *    Licensed under the Apache License, Version 2.0 (the "License");
 *    you may not use this file except in compliance with the License.
 *    You may obtain a copy of the License at
 *
 *        http://www.apache.org/licenses/LICENSE-2.0
 *
 *    Unless required by applicable law or agreed to in writing, software
 *    distributed under the License is distributed on an "AS IS" BASIS,
 *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *    See the License for the specific language governing permissions and
 *    limitations under the License.
 */
package ru.org.linux.csrf;

import com.google.common.collect.ImmutableMap;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.springframework.stereotype.Component;
import org.springframework.web.servlet.support.RequestDataValueProcessor;

import javax.servlet.http.HttpServletRequest;
import java.util.Map;

import static ru.org.linux.csrf.CSRFProtectionService.CSRF_ATTRIBUTE;
import static ru.org.linux.csrf.CSRFProtectionService.CSRF_INPUT_NAME;

//
// Thanks to http://blog.eyallupu.com/2012/04/csrf-defense-in-spring-mvc-31.html for the idea
//
@Component("requestDataValueProcessor")
public class CSRFRequestDataValueProcessor implements RequestDataValueProcessor {
    private static final Log logger = LogFactory.getLog(CSRFRequestDataValueProcessor.class);

    @Override
    public String processAction(HttpServletRequest request, String action) {
        return action;
    }

    @Override
    public String processFormFieldValue(HttpServletRequest request, String name, String value, String type) {
        return value;
    }

    @Override
    public Map<String, String> getExtraHiddenFields(HttpServletRequest request) {
        String csrfAttribute = (String) request.getAttribute(CSRF_ATTRIBUTE);

        if (csrfAttribute != null) {
            return ImmutableMap.of(CSRF_INPUT_NAME, csrfAttribute);
        } else {
            logger.debug("missing CSRF attribute " + request.getRequestURI());

            return null;
        }
    }

    @Override
    public String processUrl(HttpServletRequest request, String url) {
        return url;
    }
}